Dye machine



May 12, 1970 osAMu FuJn 3,511,068

.DYE MACHINE Filed May 29, 1968 6 ,sheets-sheet 1 f), q2-b 6b 22 l|35ghz? I4 ,bm I8 @5% Mayl 12, 1970 @SAMU FuJn 3,511,068

v DYE MACHINE Filed May 29, 1968 e sheets-sheet 2 May 12, 1970 osAMUFUJH 3,511,068

DYE MAGHINE med May 29, 196s e sheets-sheet May 12, 1970 5 osAMu FUJn3,511,068

` DYE MACHINE Filed May 29, 1968 4 6 Sheets-Sheet 4 OSAMU FUJII DYE'MACHINE May 12, 1970 6 Sheets-Sheet 5 Filed May 29, 1968 2'0 4'0 60 8'0-ICO TEMPERATURE oF LIQUID in c Maty 12, 1970 Filed May 29. 1968 osMljvFUJu 3,51 1,068

- DYEMAGHINE l e sheets-sheet e United States Patent O 3,511,068 DYEMACHINE Osamu Fujii, Toyonaka-shi, Osaka, Japan, assignor to HisakaWorks, Ltd., Osaka, Japan, a company of Japan Filed May 29, 1968, Ser.No. 733,132

Claims priority, application Japan, Mar. 14, 1968, 43/16,188; Mar. 28,1968, 43/ 19,724

Int. Cl. D061? 17/02 U.S. Cl. 68-177 14 Claims ABSTRACT F THE DISCLOSUREIn a dye machine, a circular bath is provided and includes at least onedrive roll and a constrictive canal portion to circulate the fabric inthe circular bath. A pressure control device, a device for circulating aportion of the treating liquor, means for controlling level of thetreating liquor, and means for preventing cavitation of the circulatingdevice are attached to the machine.

The present invention relates to dye machines and, more particularly, tomultipurpose dye machines for treating fabrics under either highpressure or normal pressure in a dye liquor or a washing and scouringliquor.

The principal object of the present invention is to provide an improvedand eiiicient dye machine suitable for processing fabric under eitherhigh or normal pressure by conveying it through a liquid treating bath,wherein a portion of the liquid is circulated by a circulating means sothat the textile material is further carried by liquid stream generatedby a circulating means and carried by a mechanical means including atleast single drive roll.

Another object of the invention is to provide a dye machine providedwith a novel pressure control means suitable for processing fabric undera controlled pressure and temperature.

A further object of the invention is to provide a dye machine providedwith a level control means for controlling the level of dye liquor in aliquid treating bath during the processing.

A still further object of the invention is to provide a dye machineprovided with an improved liquid circulating means without cavitation ofthe liquid pump, to obtain high working efliciency of the dye machine.

These and other objects and advantages of the present invention willappear more fully in the following specification, claims and drawingswherein:

FIG. l is a side elevational view of an embodiment of the dye machine ofthe present invention, portions being broken away to illustrate variousfeatures of the present invention,

FIG. 2A is a side view, partly in section taken along line IIA-IIA, ofthe level control device shown in FIG. 1,

FIG. 2B is a sectional view, in detail, of the level con trol deviceshown in FIG. 2A, l

FIG. 2C is a cross sectional view of the level control device takenalong line IIC-IIC in FIG. 2B,

FIG. 2D is a cross sectional view of the level control device takenalong line IID-IID in FIG. 2B,

FIGS. 3 and 4 are side elevational views of the modied embodimentts ofthe dye machine shown in FIG. 1,

FIG. 5 is a diagrammatic view of the pressure control means forcontrolling the gas pressure in the closed dye bath of the machine ofthe invention,

FIG. 6 is a side elevational view of another embodiment of the dyemachine provided with a novel means for recycling dye liquor or washingand scouring liquor,

according to the present invention,

ice

FIG. 7 is a diagram illustrating the relation between the temperature ofcirculating liquid and the quantity of liquid delivered from the pump.

Generally, the dye machine of the present invention comprises aplurality of unit mechanisms having the same function. Therefore, onlythe unit mechanism of the dye machine of the present invention ishereinafter explained to simplify the illustration of the invention.

Referring to FIGS. 1, 2A, 2B, 2C and 2D, a typical dye machine of thepresent invention is shown as comprising a dye bath having a cylindricalouter tank 1 disposed horizontally upon support frames 1a, 1b, and aninside shell 2 horizontally disposed in the outer tank 1.

All interior parts of the tank 1 and the inside shell 2, or parts of thesystem which come into contact with the corrosive water or dyestuifs,are preferably constructed of stainless steel, similar corrosiveresistant metal or corrosive resistant plastic. The inside shell 2 ishorizontally disposed in the tank 1 so as to form an approximatelycircular bath 5 between the inside wall of the tank 1 and the outsidewall of the inside shell 2 as shown in FIG. 1. A porthole 4 ispositioned at the top portion of the tank 1. The approximately circularbath 5 comprises a starting inclined portion 5a, a narrow canal portion5b, a bottom portion 5c, an expanded storing portion 5d and a topportion Se. A drive roll 3 is disposed in the top portion 5e of thecircular bath 5, preferably at the boundary between the starting portion5a and the top portion 5e. A superposed body of gas is contained in thetop portion 5e during the operation of the dye machine. A double pair ofsymmetrical curved plates 6a and 6b are disposed in the narrow canalportion l5b of the space 5 as shown in FIG. 1, so as to form a doubleconstricted canal. At the bottom portion 5c of the space 5, a perforatedbottom plate 7 is disposed so as to form a bottom space 8 between thetank 1 and the perforated bottom plate 7. At an upper portion of theinside shell of the expanded portion 5d, an adjusting tank 9 issupported by the inside shell 2, and the adjusting tank 9 is incommunication with the expanded portion Sd through a perforated wall 2aof the inside shell 2. Both sides of the inside shell 2 are closed sothat an inside reserve tank 2b is formed. Referring to FIGS. 2A, 2B, 2Cand 2D, a level control device 10 is connected t0 the adjusting tank 9by a lower connecting conduit 10b and further connected to the circularbath 5 by an upper connecting conduit 10c superimposed upon the lowerconnecting conduit 10b. The level control device 10 comprises an outervcylindrical liquid container 10d and an inner cylinder 10a coaxiallysecured to the bottom portion of the container 10d.

At the top portion of the cylinder 10d, a vertical rod 10h rotatablyengages with a collar 10j affixed to the central top portion of theouter cylindrical liquid container 10d. The lower portion of thevertical rod 10h is provided with a screw thread which adjustablyengages with a mating member 10g rigidly connected to an intermediatecylindrical shell 10e coaxially disposed in the outer cylindrical liquidcontainer 10d in such a way that the lower end of the shell 10e slidablyengages with the top end portion of the inner cylinder 10a. On the otherhand, the top end of the intermediate cylindrical shell 10e is providedwith a plurality of arms 10i and a boss containing the thread member10g. Consequently, the space defined by the inner cylinder 10a and theintermediate cylindrical shell 10e can be adjusted by turning thevertical rod 10h. To turn the vertical rod 10h, a handle 10i is securedto the top end of the vertical rod 10h. A Abottom end of the innercylinder 10a is connected with a conduit 10k, the bottom end of theconduit 10k opens into the reserve inside tank 2b. Further, a controlvalve 11 is positioned in the conduit 10k and controls the ilowtherethrough. A discharge conduit 10l is fluidly connected to the innercylinder 10a and a valve v 11a is positioned within the conduit 10! soas to control the opening and closing of the conduit 10l. A conduit 12is connected with the bottom of the tank 1 at a position under theperforated bottom plate 7 and is also connected to a return conduit 16.A conduit 13 is connected with the bottom of the inside reserve tank 2band is also connected with the conduit 16. Control valves 14 and 15 arerespectively positioned within the conduits 12 and 13 so as to controlthe liquid stream passing through the respective conduits 12 and 13. Theconduit 16 is connected with a circulating pump 21. A conduit 22 isconnected at one of its ends to the circular bath at the narrow canalportion 5b, as shown in FIG. 1, and is connected at its other end to anoutlet of the pump 21. The conduit 22 has a portion extending through aheater 23. A control valve 24 is positioned within the conduit 22 so asto control the quantity of the liquid passing through the conduit 22. Adischarge conduit 17, controlled by a valve 18, is connected with theconduit 16 and a water supply conduit 19, controlled by a valve 20, isalso connected with the conduit 16. The particular connection of theconduit 22 to the narrow canal portion 5b of the circular bath 5 isselected such that the end of the conduit 22 faces the curved plate 6aso as to form a jet stream at the constricted canal portions of thecurved plates 6a and 6b when liquid is supplied from the conduit 22 intothe circular lbath 5.

A pressure control device 26 is disposed at the vtop portion of thecircular bath 5, preferably the top portion forming the startinginclined portion 5a of the circular bath 5.

The inside shell of the starting inclined portion 5a is preferablyformed as an inclined plane as shown in FIG. 1.

In the operation of the dye machine shown in FIG. 1, a treating liquoris rst supplied into the circular bath 5 through the porthole 4. Whenthe level of the treating liquid in the circular bath exceeds the toplevel of the adjusting tank 9, the level of the treating liquid isadjusted lby turning the handle i of the level control device 10 and thesupply of the treating liquid is stopped. Then the pump 21 is driven tocirculate a portion of the treating liquid in the tank 1 by way of thecirculating means comprising the conduits 12, 16, 22 and the pump 21.'In other words, a portion of the treating liquid in the tank 1 issucked by the pipe 12 and fed into the narrow canal portion 5b of thecircular bath 5 by the pipe 22. During the circulation of the treatingliquid, the circulating liquid is heated by the heater 23 so as tomaintain the temperature of the treating liquid at the predeterminedtemperature. When the pump 21 is driven and the circulating liquid isfed into the narrow canal portion 5b, a jet stream of the treatingliquid is formed at the narrow canal portion 5b, and consequently, thetreating liquid ows at high speed to both the bottom portion 5c and tothe expanded storing portion 5d of the bath 5. One end of a fabric 30 isfed into the circular -bath 5 through the porthole 4 and then led to thenarrow canal portion 5b by the rotation of the drive roll 3. When theend of the fabric 30 is fed into the treating liquid, the top end of thefabric 30 is sucked into the narrow canal portion 5b by the jet streamof the treating liquid and the end of the fabric 30 is then carried tothe expanded storing portion 5d. In the expanded storing portion 5d ofthe circular bath 5, the fabric 30 is stocked and nally the top end ofthe fabric is pushed up to the surface of the treating liquid. Next thedriving of the drive roll 3 is stopped and the top end of the fabric isjoined to the other end of the is then sucked into the narrow canalportion 5b by the jet stream of the treating liquid whereupon it iscarried to the bottom portion 5c and the expanded storing portion 5d ofthe bath 5. As mentioned above, the portion of the fabric carried to theexpanded storing portion 5d is continuously pushed upwardly by thatportion of the fabric coming from the bottom portion 5c and consequentlythe level of treating liquid in the expanded storing portion 5d becomeshigher than the level of the treating liquid in the starting inclinedportion 5a. The level of the treating liquors in the expanded portion 5dand in the outer liquid container 10d are maintained at the same levelby means of the connection of both portions by way of the adjusting tank9 and the connecting conduit 10b and the excessive treating liquor inthe expanded storing portion 5d of the outer liquid container overflowsinto the intermediate cylindrical shell. Consequently, when the valve 11is opened, the overflowed liquid is fed into the inside reserve tank 2b.Therefore, the level of the treating liquor in the circular bath 5 canbe always maintained at a constant level.

The quantity of the excessive liquor in the circular bath 5 changes inaccordance with the particular mass 0f the fabric being treated. Forinstance, if a certain fabric having a large mass is to be dyed by thedye machine of the present invention, such can be accomplished with agood result. In this case, the excessive dye liquor can be reserved inthe inside reserve tank 2b and further is circulated by a circulatingmeans comprising the conduits 13, 16 and 22, pum-p 21 and heater 23 atany desired setting of the valves 15 and 24. Consequently, any liquor tofabric ratio can be obtained, Further, when the valve 14 is opened, thetreating liquor in the inside reserve tank 2b is circulated togetherwith the treating liquor sucked from the bottom portion 5c of thecircular bath v5 and when the valve 11 is opened, the treating liquid inthe expanded storing portion 5d is fed into the inside reserve tank 2bthrough the conduit 10. By controlling the opening of the valves 11 and15, the circulation speed of the liquid in the bath 5 can be controlled.The fabric carried to the bottom portion l5c of the bath Sis smoothlypushed toward the expanded storing portion 5d without any disturbingeddy current being imparted to the treating liquor in the bottom space 8by the perforated bottom plate 7, thereby uniform treating caneffectively be obtained by using the dye machine of the invention. Thedrive roll 3 also has the function of spreading the fabric when thefabric 30 is turning over the roll 3. This spreading action of the driveroll 3 contributes in providing the fabric with a better treating actionby the treating liquor.

Referring to FIG. 3, a different embodiment of the present invention isshown. A bypass conduit 31 is shown having one end connected with thebottom of the circular -bath l5 and the other end connected to theadjusting tank 9. As the liquid pressure at the bottom portion of thecircular bath 5 is sufficiently high to carry the treating liquor fromthe bottom portion of the tank 1 to the top portion of the expandedstoring portion 5d of the bath 5, a portion of the heated liquor jetfrom the narrow canal portion 5b is carried to the adjusting tank 9 bythe bypass conduit 31, When the valve 11 is closed, the heated liquorcarried to the adjusting tank 9 is led to the expanded storing portion5d of the circular bath 5, whereby the treating liquor in the expandedstoring portion 5d can be maintained at a better and more uniformlyheated condition.

Referring to FIG. 4, another embodiment of the present invention isshown wherein an expanded guide plate 32 is mounted on a startinginclined portion of the inside shell 2 and another drive roll 33 isdisposed in the starting inclined portion Sa of the circular bath 5 insuch a way that the drive roll 33 is positioned under the expanded guideplate 32. Therefore, the fabric 30 can lbe mildly fed into the treatingliquor without tension and, consequently, the wet processing of thefabric by the dye machine shown in FIG. 4 can be mildly performed. Sucha modification is particularly in case useful when treating light fabricand helps to prevent any mechanical damage during the processing.

When washing of the fabric treated by the dye machine of the inventionis required, the valve 20 is opened to supply fresh water through thewater supply conduit 19. The fresh water is fed into the narrow canalportion b by the action of the pump 21 and the Water is led to thebottom portion iSc of the circular bath 5. The valves 11, 15 and 18 areclosed and the valve 11a (FIG. 2A) disposed in the branch conduit 101 isopened, whereby the major portion of the fresh water used for washingthe fabric 30 in the circular bath `5 is discharged from the branchconduit 101, the other and the remaining portion of the fresh Water iscirculated by the circulating means above-described, Consequently, thewashing operation of the treated fabric can be carried out effectivelyby supplying fresh water in the manner disclosed in the presentinvention.

It has been found highly desirable to dye synthetic or man made fibersat temperatures elevated above the boiling point of the dye liquor atnormal atmospheric pressure. To carry out such a dye operation, it isnecessary to maintain the inside pressure of the circular bath at ahigher pressure than atmosphere pressure to obtain the desiredtemperature of the dye liquor. Therefore, the construction of the dyemachine must be suiiiciently strong to bear the high inside pressure ofthe tank. However, as the dyeing operation for dyeing synthetic materialcan be performed at a temperature which is a little higher than theboiling point of the dye liquor for example 100-105 C., if an effectivepressure control of the inside pressure of the circular bath can beobtained, very effective and economic dyeing of synthetic material canbe achieved. Our improved dye machine is suitable for theabove-mentioned purpose.

Referring to FIGS. 1, 3, 4, 5 and 6, an embodiment of the pressurecontrol means of the invention is disclosed. The pressure control meanscomprises a conduit 35 connected with the tank 1 at the position of thetop portion 5e of the circular bath 5, a pressure control device 36 and'a safety device 37. The pressure control device 36 comprises a U-shapedconduit 36a connected at its end with the conduit 35. An opened end 36bof the U-shaped conduit 36a faces an opening of a water supply conduit36C. The opened end 36b and the opening of the water supply conduit 36care enclosed in a closed box 36d having a discharging aperture 36e. Theconstruction of the safety device 37 is almost the same as that of thepressure control device 36, that is, the safety device 37 comprises aU-shaped conduit 37a connected with the conduit 35 as one body. Anopened end 37b of the U-shaped conduit 37a faces an opening of a watersupply conduit 37e. The opened end 37b and the opening ofthe watersupply conduit 37C are enclosed in a closed box 37d having a dischargingaperture 37e as shown in FIG. 5. Water is continuously fed to the openedends 36b and 37b from the water supply conduit 36e and 37e,respectively, and the excess water which overflows from the U-shapedconduits 36a and 36b are discharged from the respective apertures 36eand 37e, The effective length of the U- shaped conduit 36a of thepressure control device 36 is shorter than that of the U-shaped conduit37a of the safety device 37, further, the thickness of the U-shapedconduit 36a is smaller than that of the U-shaped conduit 37a.

The function of the above-mentioned pressure control device ishereinafter described. Supposing the pressure in the top portion -Se ofthe bath in the tank 1 is P, and 4the treating liquor is heated tomaintain the pressure P and the balanced height of the water in theU-shaped conduit 36a is 1. If the pressure in the top portion 5e of thecircular bath 5 exceeds the predetermined pressure P, the water in thespace of lthe conduit 36a defined by an effective length l is pushed outfrom the opened end 36b of the conduit 36a, |with the attendant resultthat the gas or air in the circular bath 5 is discharged through theU-shaped conduit 36a. `On the contrary, if the pressure in the topportion 51e of the bath 5 in the tank 11 is lower than the predeterminedpressure AP, the water contained in the conduit 36a is maintained tillthe pressure of the tank 1 exceeds the level of the predeterminedpressure P. The above-mentioned effective length l of the U-shapedconduit 36a can be set to the desired pressure in the tank 1. Forexample, when the effective length l of the `U-shaped conduit 36a is setat 80 cm. and water is fed to the opened end 36b of the conduit 36a, thepressure P in the top portion 5e of the bath 5 can be set at 1.08kg./cm.2 and the liquid temperature in the tank 1 is balanced at 102 C.In other words, when the pressure P exceeds the level of thepredetermined pressure P of 1.08 kg./cm.2, or the liquid temperaturebecomes higher than 102 C., the gas in the top portion 5e of thecircular bath `5 spurts out through the conduits 35 and 37, consequentlythe pressure P and the liquid temperature go down whereupon the pressureP and the liquid temperature are again raised by the heating of the dyeliquor. The liquid temperature in the tank 1 can thus always bemaintained at the desired condition.

The thickness of the U-shaped conduit 37a must be larger than that ofthe U-shaped conduit 36a so as to prevent trouble caused by insufficientcontrol action of the pressure control device. In other words, if thethickness of the conduit 37a is less than that of the conduit 36a, thequantity of exhaust gas from the U-shaped conduit 37a may be insuicientto lower the inside pressure of the tank 1. However if the thickness ofthe conduit 37a is sufficiently larger than that of the conduit 36a,when the inside pressure of the circular bath 5 exceeds the level of thepredetermined pressure, a quantity of gas sufficient to decrease theinside pressure of the tank 1 can be exhausted through the conduit 37ain a very short time and consequently the liquid temperature can beprevented from exceeding the predetermined level. The adjustment of theworking length of the U-shaped conduit 36a can be made by shifting theportion 36b of the conduit in the upward or downward direction andtixing it at the thus set position.

When the dyeing operation is performed at a high temperature above theboiling point of the treating liquor and the treating liquor iscirculated by the pumping action of a pump, the phenomenon of cavitationof the pump may disturb the effective circulation of the treatingliquor. The above-mentioned drawback can be particularly observed when acentrifugal pump is used. In FIG. 7, an example of the relation betweenthe liquid temperature in C. and the quantity of discharging liquid inm.3/ min. from the pump 21 is shown. As is clear in FIG. 7,' thequantity of discharging liquid remarkably decreases with increase in theliquid temperature, for example, the quantity of discharging liquid at aliquid temperature of 98 C. becomes less than one fourth of that atnormal temperature. To eliminate the above-mentioned drawback of therecycling means shown in FIGS. 1, 2, and 3, a cooler `40 may be insertedin the con-duit 16 upstream of the pump 21, as shown in FIG. 6. Theliquid in the conduit 16 may then be cooled to the desired liquidtemperature wherein any troubles due to excessive temperatures areobviated. For example, when the liquid passing in the conduit 16 iscooled to 90 C., the quantity of the discharging liquid from the pump 21is increased by half over the quantity of the discharging liquid atnormal temperature, thus greatly minimizing the possibility of pumpcavitation.-

The cooled liquid discharged from the pump 21 is then heated by theheater 23 and fed into the tank 1 through the conduit 22. Theabove-mentioned phenomenon of cavitation can also be eliminated byincreasing the liquid pressure, consequently, the utilization of thecooler 40 must be decided in accordance with whether the liquid pressurein the circular bath of the tank l1 can be increased or not.

Although this invention has been described with respect to a particularembodiment thereof, it is not to be so limited as changes andmodifications may be made therein which are within the full intendedscope of the invention as defined by the appen-ded claims.

What is claimed is:

1. In a dye machine for treating fabrics moving through a treatingliquor such as a dye liquor or washing and scouring liquor, theimprovement comprising; a horizontally disposed cylindricalshaped tankforming an outer wall of said dye machine; a closed inside shellhorizontally disposed in said tank; a circular bath defined by an insidewall of said tank and an outside wall of said inside shell; means forcontrolling said treating liquor at a constant level during theoperation for treating fabric; means for moving said fabric through saidcircular bath; circulating means including a circulating pump tocirculate a portion of said treating liquor taken from a suction portionof said circular bath to an upper portion of said circular bath; aheater disposed to said circulating means for heating treating liquordischarged from said circulating pump; said circular bath provided witha narrow canal portion.

2. A dye machine of the character described in claim 1, including a,pressure control means for controlling the pressure of said superposedbody of gas at a constant condition; said pressure control meansconnected to a top portion of said tank.

'3. A dye machine of the character described in claim 1, including meansfor cooling treating liquor sucked by said circulating pump of saidcirculating means, said cooling means disposed before said circulatingpump.

4. A dye machine of the character described in claim 1, including meansfor washing fabric treated by said treating liquor by fresh water, saidwashing means comprising a water supply conduit connected to saidcirculating means and a liquid discharging conduit connected to saidmeans for controlling the level of said treating liquor.

5. A dye machine of the character described in claim 1, including abypass conduit connecting a bottom portion of said circular bath withsaid means for controlling the level of said treating liquor.

6. A dye machine of the character described in claim 1; wherein saidcircular bath comprising a circular series of several portions arrangedas a top portion, a starting inclined portion, said narrow canalportion, a bottom portion and an expanded storing portion for storingtemporary the fabric during the treating operation in due order.

7. A dye machine of the character described in claim 1; wherein saidsuction portion is provided with a perforated plate dividing saidsuction portion into a passage space for passing fabric and a spaceconnected with said circulating means for circulating a portion of saidtreating liquor.

8. A dye machine of the character described in claim 6;

wherein said narrow canal portion is provided with a douconduitsuperimposed upon said lower connecting conduit; a conduit connectingsaid level control device with a closed inside space of said insideshell; a conduit connecting said closed inside space of said insideshell with said circulating means; valves for opening or closing both ofsaid conduits; a perforated wall through which said adjusting tank isfluidally connected to said circular bath said upper connecting conduitconnecting superposed bodies of gas in said circular bath and said levelcontrol device, said lower connecting conduit connecting both treatingliquor in said adjusting tank and said level control device; said levelcontrol device provided with a mechanism for overflowing an excesstreating liquor in said device and a mechanism for adjusting level ofsaid mechanism for overflowing; thereby the level of said treatingliquor in said circulating bath can be maintained at a constant level inaccordance with adjusting level of said mechanism for overflowingtreating liquor in said level control device.

10. A dye machine of the character described in claim 8; wherein saidmeans for moving said fabric comprising a drive roll disposed in saidtop portion of said circular bath, and said double pair of circularplates.

11. A dye machine of the character described in claim 8; wherein saidmeans for moving said fabric comprising a pair of drive rolls disposedin said top portion and an inclined starting portion of said circularbath and said double pair of curved plates.

12. A dye machine of the character described in claim 1; wherein saidcirculating means to circulate a portion of said treating liquorcomprising a conduit connecting a bottom portion of said circular bathwith said circulating pump, and a conduit connecting said circulatingpump with said narrow canal portion of said circular bath.

13. A dye machine of the character described in claim 2; wherein saidpressure control means comprising a main conduit` connected to a topportion of said horizontal cylindrical tank, a safety device connectedto an end of said main conduit and a pressure control device connectedto said main conduit. 14. A dye machine of the character described inclaim 13; wherein said presure control device comprising a smallU-shaped conduit and a small water supply conduit which always pouringwater to an open end of said small U- shaped conduit, and a closed boxenclosing said small supply cond-uit and said open end of said smallU-shaped conduit, an adjusting device for adjusting level of said openend of said U-shaped conduit, another end of said small U-shaped conduitconnected to said main conduit, said closed box provided with anaperture; said safety device comprising a large U-shaped conduit and alarge water supply conduit always pouring water to an end of said largeU-shaped conduit, and a large closed box enclosing said large watersupply conduit and said open end of said large U-shaped conduitconnected to said end of main conduit, and said large closed boxprovided with an aperture.

References Cited UNITED STATES PATENTS 2,978,291 4/ 1961 Fahringer68176` X 3,094,858 6/196'3 Isley et al. 68-5 FOREIGN PATENTS 404,370l/11934 vGreat Britain. 372,019 11/ 1963 Switzerland.

WILLIAM I. PRICE, Primary Examiner

